Precise calculation of MW, sin2θ̂W (MZ), and sin2 θlepteff

The two-loop O (g⁴M²_t/M²_W) corrections are incorporated in the theoretical calculation of M_W, sin²θ̂_W(M_Z), and sin² θ^lept_eff, as functions of M_H. The analysis is carried out in a previously proposed MS formulation and two novel on-shell resummation schemes. It is found that the inclusion of the new effects sharply decreases the scheme and residual scale dependence of the calculations. QCD corrections are incorporated in two different approaches. Comparison with the world average of sin²θ^lept_eff leads to M_H = 127⁺¹⁴³_-71 GeV and M_W = 80.367 +/- 0.048 GeV, with small variations among the six calculations.